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// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.rules.workspace;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.UnmodifiableIterator;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.FileProvider;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.syntax.ClassObject;
import com.google.devtools.build.lib.syntax.SkylarkNestedSet;
/**
* Implementation for the bind rule.
*/
public class Bind implements RuleConfiguredTargetFactory {
/**
* This configured target pretends to be whatever type of target "actual" is, returning its
* transitive info providers and target, but returning the label for the //external target.
*/
private static class BindConfiguredTarget implements ConfiguredTarget, ClassObject {
private Label label;
private ConfiguredTarget configuredTarget;
private BuildConfiguration config;
BindConfiguredTarget(RuleContext ruleContext) {
label = ruleContext.getRule().getLabel();
config = ruleContext.getConfiguration();
// TODO(bazel-team): we should special case ConfiguredTargetFactory.createConfiguredTarget,
// not cast down here.
configuredTarget = (ConfiguredTarget) ruleContext.getPrerequisite("actual", Mode.TARGET);
}
@Override
public <P extends TransitiveInfoProvider> P getProvider(Class<P> provider) {
return configuredTarget == null ? null : configuredTarget.getProvider(provider);
}
@Override
public Label getLabel() {
return label;
}
@Override
public Object get(String providerKey) {
return configuredTarget == null ? null : configuredTarget.get(providerKey);
}
@Override
public UnmodifiableIterator<TransitiveInfoProvider> iterator() {
return configuredTarget == null
? ImmutableList.<TransitiveInfoProvider>of().iterator()
: configuredTarget.iterator();
}
@Override
public Target getTarget() {
return configuredTarget == null ? null : configuredTarget.getTarget();
}
@Override
public BuildConfiguration getConfiguration() {
return config;
}
/* ClassObject methods */
@Override
public Object getValue(String name) {
if (name.equals("label")) {
return getLabel();
} else if (name.equals("files")) {
// A shortcut for files to build in Skylark. FileConfiguredTarget and RunleConfiguredTarget
// always has FileProvider and Error- and PackageGroupConfiguredTarget-s shouldn't be
// accessible in Skylark.
return SkylarkNestedSet.of(Artifact.class, configuredTarget == null
? NestedSetBuilder.<Artifact>emptySet(Order.STABLE_ORDER)
: getProvider(FileProvider.class).getFilesToBuild());
}
return configuredTarget == null ? null : configuredTarget.get(name);
}
@SuppressWarnings("cast")
@Override
public ImmutableCollection<String> getKeys() {
ImmutableList.Builder<String> result = ImmutableList.<String>builder().add("label", "files");
if (configuredTarget != null) {
result.addAll(
configuredTarget.getProvider(RuleConfiguredTarget.SkylarkProviders.class).getKeys());
}
return result.build();
}
@Override
public String errorMessage(String name) {
// Use the default error message.
return null;
}
}
@Override
public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedException {
if (ruleContext.getPrerequisite("actual", Mode.TARGET) == null) {
ruleContext.ruleError(String.format("The external label '%s' is not bound to anything",
ruleContext.getLabel()));
return null;
}
return new BindConfiguredTarget(ruleContext);
}
}
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